In geometry, a translation is the shifting of a figure from one place to another without rotating, reflecting or changing its size. This is done by moving the vertices of the figure the prescribed number of spaces on a coordinate plane and then drawing the new figure.
These PFDs are designed to keep the wearer in a vertical position, but it is the wearersâ responsibility to maneuver themselves into a face-up position. Type III PFDs will keep unconscious wearers face-up just as well as a Type II vest.
p-Phenylenediamine is soluble in water, alcohol, and ether and only slightly soluble in chloroform. All grades of PPD are sensitive to air and/or moisture, and the presence of either tends to hasten color deterioration. It may darken on storage. This effect is less pronounced in the high purity grade.